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Carousel.js
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Carousel.js
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import React from 'react';
import PropTypes from 'prop-types';
import classNames from 'classnames';
import CarouselItem from './CarouselItem';
import { mapToCssModules } from './utils';
class Carousel extends React.Component {
constructor(props) {
super(props);
this.handleKeyPress = this.handleKeyPress.bind(this);
this.renderItems = this.renderItems.bind(this);
this.hoverStart = this.hoverStart.bind(this);
this.hoverEnd = this.hoverEnd.bind(this);
this.state = {
direction: 'right',
indicatorClicked: false,
};
}
getChildContext() {
return { direction: this.state.direction };
}
componentDidMount() {
// Set up the cycle
if (this.props.ride === 'carousel') {
this.setInterval();
}
// TODO: move this to the specific carousel like bootstrap. Currently it will trigger ALL carousels on the page.
document.addEventListener('keyup', this.handleKeyPress);
}
UNSAFE_componentWillReceiveProps(nextProps) {
this.setInterval(nextProps);
// Calculate the direction to turn
if (this.props.activeIndex + 1 === nextProps.activeIndex) {
this.setState({ direction: 'right' });
} else if (this.props.activeIndex - 1 === nextProps.activeIndex) {
this.setState({ direction: 'left' });
} else if (this.props.activeIndex > nextProps.activeIndex) {
this.setState({ direction: this.state.indicatorClicked ? 'left' : 'right' });
} else if (this.props.activeIndex !== nextProps.activeIndex) {
this.setState({ direction: this.state.indicatorClicked ? 'right' : 'left' });
}
this.setState({ indicatorClicked: false });
}
componentWillUnmount() {
this.clearInterval();
document.removeEventListener('keyup', this.handleKeyPress);
}
setInterval(props = this.props) {
// make sure not to have multiple intervals going...
this.clearInterval();
if (props.interval) {
this.cycleInterval = setInterval(() => {
props.next();
}, parseInt(props.interval, 10));
}
}
clearInterval() {
clearInterval(this.cycleInterval);
}
hoverStart(...args) {
if (this.props.pause === 'hover') {
this.clearInterval();
}
if (this.props.mouseEnter) {
this.props.mouseEnter(...args);
}
}
hoverEnd(...args) {
if (this.props.pause === 'hover') {
this.setInterval();
}
if (this.props.mouseLeave) {
this.props.mouseLeave(...args);
}
}
handleKeyPress(evt) {
if (this.props.keyboard) {
if (evt.keyCode === 37) {
this.props.previous();
} else if (evt.keyCode === 39) {
this.props.next();
}
}
}
renderItems(carouselItems, className) {
const { slide } = this.props;
return (
<div className={className}>
{carouselItems.map((item, index) => {
const isIn = (index === this.props.activeIndex);
return React.cloneElement(item, {
in: isIn,
slide: slide,
});
})}
</div>
);
}
render() {
const { cssModule, slide, className } = this.props;
const outerClasses = mapToCssModules(classNames(
className,
'carousel',
slide && 'slide'
), cssModule);
const innerClasses = mapToCssModules(classNames(
'carousel-inner'
), cssModule);
// filter out booleans, null, or undefined
const children = this.props.children.filter(child => child !== null && child !== undefined && typeof child !== 'boolean');
const slidesOnly = children.every(child => child.type === CarouselItem);
// Rendering only slides
if (slidesOnly) {
return (
<div className={outerClasses} onMouseEnter={this.hoverStart} onMouseLeave={this.hoverEnd}>
{this.renderItems(children, innerClasses)}
</div>
);
}
// Rendering slides and controls
if (children[0] instanceof Array) {
const carouselItems = children[0];
const controlLeft = children[1];
const controlRight = children[2];
return (
<div className={outerClasses} onMouseEnter={this.hoverStart} onMouseLeave={this.hoverEnd}>
{this.renderItems(carouselItems, innerClasses)}
{controlLeft}
{controlRight}
</div>
);
}
// Rendering indicators, slides and controls
const indicators = children[0];
const wrappedOnClick = (e) => {
if (typeof indicators.props.onClickHandler === 'function') {
this.setState({ indicatorClicked: true }, () => indicators.props.onClickHandler(e));
}
};
const wrappedIndicators = React.cloneElement(indicators, { onClickHandler: wrappedOnClick });
const carouselItems = children[1];
const controlLeft = children[2];
const controlRight = children[3];
return (
<div className={outerClasses} onMouseEnter={this.hoverStart} onMouseLeave={this.hoverEnd}>
{wrappedIndicators}
{this.renderItems(carouselItems, innerClasses)}
{controlLeft}
{controlRight}
</div>
);
}
}
Carousel.propTypes = {
// the current active slide of the carousel
activeIndex: PropTypes.number,
// a function which should advance the carousel to the next slide (via activeIndex)
next: PropTypes.func.isRequired,
// a function which should advance the carousel to the previous slide (via activeIndex)
previous: PropTypes.func.isRequired,
// controls if the left and right arrow keys should control the carousel
keyboard: PropTypes.bool,
/* If set to "hover", pauses the cycling of the carousel on mouseenter and resumes the cycling of the carousel on
* mouseleave. If set to false, hovering over the carousel won't pause it. (default: "hover")
*/
pause: PropTypes.oneOf(['hover', false]),
// Autoplays the carousel after the user manually cycles the first item. If "carousel", autoplays the carousel on load.
// This is how bootstrap defines it... I would prefer a bool named autoplay or something...
ride: PropTypes.oneOf(['carousel']),
// the interval at which the carousel automatically cycles (default: 5000)
// eslint-disable-next-line react/no-unused-prop-types
interval: PropTypes.oneOfType([
PropTypes.number,
PropTypes.string,
PropTypes.bool,
]),
children: PropTypes.array,
// called when the mouse enters the Carousel
mouseEnter: PropTypes.func,
// called when the mouse exits the Carousel
mouseLeave: PropTypes.func,
// controls whether the slide animation on the Carousel works or not
slide: PropTypes.bool,
cssModule: PropTypes.object,
className: PropTypes.string,
};
Carousel.defaultProps = {
interval: 5000,
pause: 'hover',
keyboard: true,
slide: true,
};
Carousel.childContextTypes = {
direction: PropTypes.string
};
export default Carousel;